CN114135890B - Comprehensive treatment system for flue gas and control method thereof - Google Patents
Comprehensive treatment system for flue gas and control method thereof Download PDFInfo
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- CN114135890B CN114135890B CN202111478576.5A CN202111478576A CN114135890B CN 114135890 B CN114135890 B CN 114135890B CN 202111478576 A CN202111478576 A CN 202111478576A CN 114135890 B CN114135890 B CN 114135890B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/04—Arrangement or mounting of control or safety devices for sorption type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a comprehensive treatment system for flue gas and a control method thereof.A flue gas inlet of a flue gas cooler is communicated with a main process smoke discharging channel, a flue gas outlet of the flue gas cooler is communicated with a flue gas inlet of a desulfurizing tower, and a flue gas outlet of the desulfurizing tower is communicated with a chimney; the water inlet and the water outlet of the flue gas cooler are respectively communicated with the water outlet of the generator of the absorption heat pump and the water inlet of the auxiliary heating device; the slurry outlet of the desulfurizing tower is communicated with the slurry inlet of the slurry cooler; the slurry outlet of the slurry cooler is communicated with the slurry inlet of the desulfurizing tower; the water inlet and the water outlet of the slurry cooler are respectively communicated with the water outlet and the water inlet of the evaporator of the absorption heat pump; the water inlet and the water outlet of the terminal heat exchange device are respectively communicated with the water outlet of the condenser of the absorption heat pump and the water inlet of the absorber of the absorption heat pump, and the terminal heat exchange device is used for realizing heat exchange between the heat circulating water and the heat medium of a heat user.
Description
Technical Field
The invention relates to the technical field of industrial energy conservation and environmental protection, in particular to a comprehensive treatment system for flue gas and a control method thereof.
Background
The Chinese energy structure is characterized by rich coal, lean oil and less gas, which determines that the energy source required by domestic industrial production is mainly coal, and the total energy consumption proportion is about 70 percent. The coal-fired flue gas contains a large amount of nitrogen oxides, sulfur oxides, carbon oxides, smoke dust, water and other components, and is a main cause of greenhouse effect and haze in recent years. In order to improve the living environment of the national people, most of domestic coal production processes are successively completed with desulfurization, denitration and dust removal engineering improvement through efforts for many years, which plays an important role in improving the quality of the atmosphere. Among them, wet desulfurization is the most widely used desulfurization process in the industry at present due to its advantages of high desulfurization efficiency, high technical maturity, strong stability, and the like.
In the wet desulfurization process, the circulating slurry and the flue gas realize desulfurization and cooling of the flue gas in a direct contact manner, however, the water consumption in the whole process is very high, so that the operation cost of enterprises is increased, and conditions are created for the generation of haze weather; in order to solve the environmental problems such as haze caused by wet desulfurization, a great deal of technical research and engineering practice are performed by a plurality of industry professionals and research institutions, for example, the smoke heat transfer process or the process of directly cooling the smoke is adopted to increase the smoke unsaturation degree or reduce the smoke moisture content. A large number of practices prove that the method can only achieve the effect of alleviating the problems to a certain extent, but cannot eliminate the root of the problems, the whole process is huge in energy consumption, and meanwhile, the desulfurization process is huge in running water consumption, so that the production and operation costs of enterprises are high, and the sustainable development of the production and operation of industrial enterprises is also not facilitated.
Therefore, there is a need in the market for a more energy-efficient comprehensive flue gas treatment system to make up for the deficiencies of the prior engineering technologies, and a comprehensive flue gas treatment system and a control method thereof are proposed based on the above-mentioned situations.
Disclosure of Invention
The invention aims to provide a comprehensive flue gas treatment system and a control method thereof, which solve the problems of high energy consumption and high water consumption in desulfurization operation in the existing flue gas treatment technology.
In order to achieve the above object, the present invention provides a comprehensive treatment system for flue gas, the comprehensive treatment system for flue gas comprising: the system comprises an absorption heat pump, a flue gas cooler, a desulfurizing tower, a slurry cooler, a terminal heat exchange device and an auxiliary heating device;
the flue gas cooler flue gas inlet is communicated with the main process smoke discharging channel, the flue gas cooler flue gas outlet is communicated with the desulfurizing tower flue gas inlet, and the desulfurizing tower flue gas outlet is communicated with the chimney inlet;
the water inlet of the flue gas cooler is communicated with the water outlet of the generator of the absorption heat pump, and the water outlet of the flue gas cooler is communicated with the water inlet of the auxiliary heating device; and the water outlet of the auxiliary heating device is communicated with the water inlet of the generator of the absorption heat pump. The slurry outlet of the desulfurizing tower is communicated with the slurry inlet of the slurry cooler; and a slurry outlet of the slurry cooler is communicated with a slurry inlet of the desulfurizing tower.
The water inlet of the slurry cooler is communicated with the water outlet of the evaporator of the absorption heat pump, and the water outlet of the slurry cooler is communicated with the water inlet of the evaporator of the absorption heat pump.
The terminal heat exchange device is used for realizing heat exchange between heat circulating water and heat user heat medium, wherein the heat circulating water is circulating water between the terminal heat exchange device and the absorption heat pump, and the heat user heat medium is circulating heat carrying medium between the terminal heat exchange device and the heat user.
Optionally, the comprehensive flue gas treatment system further comprises: the system comprises a central control device electrically connected with an absorption heat pump, and a first temperature sensor, a first circulating water pump, a smoke analyzer, a slurry circulating pump, a second temperature sensor and a second circulating water pump which are electrically connected with the central control device;
the first circulating water pump is arranged on a pipeline between the water inlet of the flue gas cooler and the water outlet of the generator of the absorption heat pump;
the first temperature sensor is arranged on a pipeline between the water outlet of the auxiliary heating device and the water inlet of the generator of the absorption heat pump;
the slurry circulating pump is arranged on a pipeline between the slurry outlet of the desulfurizing tower and the slurry inlet of the slurry cooler;
The flue gas analyzer is arranged on a flue gas channel of the flue gas outlet of the desulfurizing tower, which is connected with a chimney;
the second circulating water pump is arranged on a pipeline between the water outlet of the terminal heat exchange device and the water inlet of the absorber of the absorption heat pump;
the second temperature sensor is arranged on a pipeline between the terminal heat exchange device water inlet and the condenser water outlet of the absorption heat pump.
Optionally, the comprehensive flue gas treatment system further comprises: the third circulating water pump, the first smoke water content analyzer, the second smoke water content analyzer, the pressure analyzer and the third temperature sensor are electrically connected with the central control device;
the third circulating water pump is arranged on a pipeline between the water inlet of the slurry cooler and the water outlet of the evaporator of the absorption heat pump;
the first flue gas moisture content analyzer and the pressure analyzer are arranged on a flue gas channel which is communicated with a flue gas outlet of the flue gas cooler and a flue gas inlet of the desulfurizing tower;
the third temperature sensor and the second flue gas moisture content analyzer are arranged on a flue gas channel, wherein the flue gas outlet of the desulfurizing tower is connected with a chimney.
The invention also provides a control method of the comprehensive flue gas treatment system, which comprises the following steps:
Acquiring the water temperature of the inlet of the generator acquired by the first temperature sensor;
comparing the generator inlet water temperature with the lower limit of the set temperature of the absorption heat pump driving heat source:
when the temperature of the inlet water of the generator is higher than or equal to the lower limit of the set driving heat source set by the absorption heat pump, no adjustment is made;
when the temperature of the inlet water of the generator is lower than the lower limit of the set temperature of the driving heat source of the absorption heat pump, the working frequency of the first circulating water pump is reduced through the central control device so as to raise the temperature of the water inlet of the generator until the first circulating water pump reaches the minimum safe working frequency;
if the water temperature at the inlet of the generator is equal to the lower limit of the set temperature of the driving heat source of the absorption heat pump in the process of adjusting the working frequency of the first circulating water pump by the central control device, stopping adjusting the working frequency of the first circulating water pump;
if the first circulating water pump reaches the minimum safe working frequency, the water temperature at the inlet of the generator is still lower than the set temperature lower limit of the driving heat source of the absorption heat pump, the auxiliary heating device is started through the central control device, the heating power of the auxiliary heating device is gradually increased, and the water is heated until the water temperature at the inlet of the generator is equal to the set temperature lower limit of the driving heat source of the absorption heat pump, and the auxiliary heating device is stopped being regulated;
Acquiring the outlet water temperature of the condenser acquired by the second temperature sensor;
comparing the condenser outlet water temperature with the condenser outlet water set temperature lower limit:
when the water temperature at the outlet of the condenser is higher than or equal to the lower limit of the set temperature of the outlet water of the condenser, no adjustment is made;
when the water temperature at the outlet of the condenser is lower than the lower limit of the set temperature of the outlet water of the condenser, reducing the working frequency of the second circulating water pump through the central control device so as to increase the water temperature at the outlet of the condenser until the second circulating water pump reaches the minimum safe working frequency;
if the water temperature at the outlet of the condenser is equal to the lower limit of the set temperature of the outlet water of the condenser in the process of adjusting the working frequency of the second circulating water pump by the central control device, stopping adjusting the working frequency of the second circulating water pump;
acquiring the sulfur content of the flue gas acquired by the flue gas analyzer;
comparing the sulfur content of the flue gas with a target sulfur content:
when the sulfur content of the flue gas is equal to the target sulfur content, no adjustment is made;
when the sulfur content of the flue gas is higher than the target sulfur content, increasing the working frequency of the slurry circulating pump through the central control device so as to improve the desulfurization efficiency of the desulfurizing tower until the slurry circulating pump reaches the maximum safe working frequency;
When the sulfur content of the flue gas is lower than the target sulfur content, reducing the working frequency of the slurry circulating pump through the central control device so as to save the power consumption of the slurry circulating pump until the slurry circulating pump reaches the minimum safe working frequency;
and if the sulfur content of the flue gas is equal to the target sulfur content in the process of adjusting the working frequency of the slurry circulating pump by the central control device, stopping adjusting the working frequency of the slurry circulating pump.
On the other hand, the invention also provides a control method of the other comprehensive flue gas treatment system, which corresponds to the comprehensive flue gas treatment system and comprises the following steps:
acquiring the water content of flue gas at the inlet of the desulfurizing tower, which is acquired by the first flue gas water content analyzer;
acquiring the pressure of flue gas at the inlet of the desulfurizing tower, which is acquired by the pressure analyzer;
calculating to obtain a target flue gas temperature according to the water content of the flue gas at the inlet of the desulfurizing tower and the pressure of the flue gas at the inlet of the desulfurizing tower;
acquiring the temperature of flue gas at the outlet of the desulfurizing tower acquired by the third temperature sensor;
comparing the target flue gas temperature with the flue gas temperature at the outlet of the desulfurizing tower:
when the target flue gas temperature is equal to the flue gas temperature at the outlet of the desulfurizing tower, no adjustment is made;
When the outlet flue gas temperature of the desulfurizing tower is higher than the target flue gas temperature:
the working frequency of the absorption heat pump is increased through a central control device until the absorption heat pump reaches the maximum safe working frequency;
if the absorption heat pump reaches the maximum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still higher than the temperature of the target flue gas, and the working frequency of the first circulating water pump is increased until the first circulating water pump reaches the maximum safe working frequency;
if the first circulating water pump reaches the maximum safe working frequency, the flue gas temperature of the desulfurizing tower is still higher than the target flue gas temperature, and the working frequency of the second circulating water pump is increased through a central control device until the second circulating water pump reaches the maximum safe working frequency;
if the second circulating water pump reaches the maximum safe working frequency, the outlet flue gas temperature of the desulfurizing tower is still higher than the target flue gas temperature, and the working frequency of the third circulating water pump is increased through a central control device until the third circulating water pump reaches the maximum safe working frequency;
when the outlet flue gas temperature of the desulfurizing tower is lower than the target flue gas temperature:
Reducing the working frequency of the first circulating water pump through a central control device until the first circulating water pump reaches the minimum safe working frequency;
if the first circulating water pump reaches the minimum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still lower than the temperature of the target flue gas, and the working frequency of the second circulating water pump is reduced through a central control device until the second circulating water pump reaches the minimum safe working frequency;
if the second circulating water pump reaches the minimum safe working frequency, the outlet flue gas temperature of the desulfurizing tower is still lower than the target flue gas temperature, and the working frequency of the third circulating water pump is reduced through a central control device until the third circulating water pump reaches the minimum safe working frequency;
if the third circulating water pump reaches the minimum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still lower than the temperature of the target flue gas, and the working frequency of the absorption heat pump is reduced through a central control device until the absorption heat pump reaches the minimum safe working frequency;
and stopping the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump if the outlet flue gas temperature of the desulfurizing tower is equal to the target flue gas temperature in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump.
Optionally, when the target flue gas temperature is compared with the flue gas temperature at the outlet of the desulfurizing tower, a specific confidence interval is designed according to different practical application scenes, and the sum of the target flue gas temperature and the confidence interval is compared with the flue gas temperature at the outlet of the desulfurizing tower as a whole.
The invention also provides a control method of the other comprehensive flue gas treatment system, which comprises the following steps:
acquiring the water content of flue gas at the inlet of the desulfurizing tower, which is acquired by the first flue gas water content analyzer;
acquiring the water content of the flue gas at the outlet of the desulfurizing tower, which is acquired by the second flue gas water content analyzer;
comparing the water content of the flue gas at the inlet of the desulfurizing tower with the water content of the flue gas at the outlet of the desulfurizing tower:
when the water content of the flue gas at the inlet of the desulfurizing tower is equal to that of the flue gas at the outlet of the desulfurizing tower, no adjustment is made;
when the moisture content of the flue gas at the inlet of the desulfurizing tower is lower than that of the flue gas at the outlet of the desulfurizing tower:
the working frequency of the absorption heat pump is increased through a central control device until the absorption heat pump reaches the maximum safe working frequency;
if the absorption heat pump reaches the maximum safe working frequency, the water content of the flue gas at the inlet of the desulfurizing tower is still lower than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the first circulating water pump is increased through a central control device until the first circulating water pump reaches the maximum safe working frequency;
If the first circulating water pump reaches the maximum safe working frequency, the water content of the flue gas at the inlet of the desulfurizing tower is still lower than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the second circulating water pump is increased through a central control device until the second circulating water pump reaches the maximum safe working frequency;
if the second circulating water pump reaches the maximum safe working frequency, the water content of the flue gas at the inlet of the desulfurizing tower is still lower than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the third circulating water pump is increased through a central control device until the third circulating water pump reaches the maximum safe working frequency;
and if the water content of the flue gas at the outlet of the desulfurizing tower is equal to that of the flue gas at the inlet of the desulfurizing tower in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
When the moisture content of flue gas at the inlet of the desulfurizing tower is higher than that of flue gas at the outlet of the desulfurizing tower:
reducing the working frequency of the first circulating water pump through a central control device until the first circulating water pump reaches the minimum safe working frequency;
If the first circulating water pump reaches the minimum safe working frequency, the water content of the flue gas at the inlet of the desulfurizing tower is still higher than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the second circulating water pump is reduced through a central control device until the second circulating water pump reaches the minimum safe working frequency;
if the second circulating water pump reaches the minimum safe working frequency, the water content of the flue gas at the inlet of the desulfurizing tower is still higher than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the third circulating water pump is reduced through a central control device until the third circulating water pump reaches the minimum safe working frequency;
if the third circulating water pump reaches the minimum safe working frequency, the water content of the flue gas at the inlet of the desulfurizing tower is still higher than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the absorption heat pump is reduced through a central control device until the absorption heat pump reaches the minimum safe working frequency;
and if the water content of the flue gas at the outlet of the desulfurizing tower is equal to that of the flue gas at the inlet of the desulfurizing tower in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
Optionally, when the water content of the flue gas at the inlet of the desulfurizing tower is compared with the water content of the flue gas at the outlet of the desulfurizing tower, a specific confidence interval is designed according to different practical application scenes, and the sum of the water content of the flue gas at the inlet of the desulfurizing tower and the confidence interval is used as a whole to be compared with the water content of the flue gas at the outlet of the desulfurizing tower.
According to the specific invention content provided by the invention, the invention discloses the following technical effects:
the invention provides a comprehensive flue gas treatment system and a control method thereof, wherein the comprehensive flue gas treatment system comprises an absorption heat pump, a flue gas cooler, a desulfurizing tower, a slurry cooler, a terminal heat exchange device and an auxiliary heating device; the flue gas inlet of the flue gas cooler is communicated with the main process smoke discharging channel; the flue gas outlet of the flue gas cooler is communicated with the flue gas inlet of the desulfurizing tower, and the flue gas outlet of the desulfurizing tower is communicated with a chimney; the water inlet of the smoke cooler is communicated with the water outlet of the generator of the absorption heat pump, the water outlet of the smoke cooler is communicated with the water inlet of the auxiliary heating device, and the water inlet of the generator of the absorption heat pump is communicated with the water outlet of the auxiliary heating device; the slurry outlet of the desulfurizing tower is communicated with the slurry inlet of the slurry cooler; the slurry outlet of the slurry cooler is communicated with the slurry inlet of the desulfurizing tower; the water inlet of the slurry cooler is communicated with the water outlet of the evaporator of the absorption heat pump, and the water outlet of the slurry cooler is communicated with the water inlet of the evaporator of the absorption heat pump; the terminal heat exchange device is communicated with the water outlet of the condenser of the absorption heat pump, the water outlet of the terminal heat exchange device is communicated with the water inlet of the absorber of the absorption heat pump, and the terminal heat exchange device is used for realizing heat exchange between the heat circulating water and the heat medium of a heat user. According to the invention, waste heat resources with different grades in the original flue gas treatment process are utilized in a cascade manner and are respectively used as a high-temperature heat source and a low-temperature heat source of the absorption heat pump, so that a large amount of medium-temperature heat sources capable of being used for production or life are prepared, waste heat recovery and utilization of flue gas waste heat are realized, meanwhile, the water consumption of desulfurization production operation is obviously reduced, and the method has important practical significance for clean and efficient production and sustainable development of industrial enterprises.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a comprehensive flue gas treatment system according to embodiments 1-4 of the present invention;
fig. 2 is a flowchart of the control method for the first circulating water pump according to embodiment 5 of the present invention;
fig. 3 is a flowchart of the control method for controlling the second circulating water pump according to embodiment 5 of the present invention;
FIG. 4 is a flow chart of the control method for the slurry circulation pump according to the embodiment 5 of the present invention;
FIG. 5 is a flowchart of a control method according to embodiment 6 of the present invention;
fig. 6 is a flowchart of a control method provided in embodiment 7 of the present invention.
Symbol description: 1-a flue gas cooler; 2-a desulfurizing tower; 3-chimney; 4-slurry cooler; 5-a slurry circulation pump; 6-a third circulating water pump; 7-absorption heat pump; 8-a first circulating water pump; 9-a second circulating water pump; 10-a terminal heat exchange device; 11-auxiliary heating means; 12-a first flue gas water content analyzer; 13-a pressure analyzer; 14-a third temperature sensor; 15-a flue gas analyzer; 16-a second flue gas water content analyzer; 17-a first temperature sensor; 18-a second temperature sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a comprehensive flue gas treatment system and a control method thereof, which solve the problems of high energy consumption and high desulfurization operation water consumption in the existing flue gas treatment technology.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1:
as shown in fig. 1, the present invention provides a comprehensive flue gas treatment system, comprising: an absorption heat pump 7, a flue gas cooler 1, a desulfurizing tower 2, a slurry cooler 4, a terminal heat exchange device 10 and an auxiliary heating device 11.
The main process smoke discharging channel is communicated with a smoke inlet of the smoke cooler 1, a smoke outlet of the smoke cooler 1 is communicated with a smoke inlet of the desulfurizing tower 2, and a smoke outlet of the desulfurizing tower 2 is communicated with the chimney 3; the water inlet of the flue gas cooler 1 is communicated with the water outlet of the generator of the absorption heat pump 7, the water outlet of the flue gas cooler 1 is communicated with the water inlet of the auxiliary heating device 11, and the water inlet of the generator of the absorption heat pump 7 is communicated with the water outlet of the auxiliary heating device 11.
High-temperature flue gas from the main production process is led into a flue gas cooler 1 to exchange heat with low-temperature water from a generator of an absorption heat pump 7, and the high-temperature flue gas is cooled by the flue gas cooler 1 and then enters a desulfurizing tower 2 through a flue; the low-temperature water absorbs heat and is discharged from the water outlet of the flue gas cooler 1 after being heated, and returns to the generator of the absorption heat pump 7 through a pipeline after passing through the auxiliary heating device 11, and is used as a driving heat source of the generator of the absorption heat pump 7.
The slurry outlet of the desulfurizing tower 2 is communicated with the slurry inlet of the slurry cooler 4; the slurry outlet of the slurry cooler 4 communicates with the slurry inlet of the desulfurization tower 2.
The cooled flue gas from the flue gas cooler 1 is in direct contact with cooling slurry from the slurry cooler 4 in the desulfurizing tower 2 to complete the heat and mass transfer process, and the flue gas is discharged to the atmosphere through the chimney 3 after heat release and cooling; and the cooled slurry after absorbing heat is introduced into the slurry cooler 4 through a pipeline from the slurry outlet of the desulfurizing tower 2.
The water inlet of the slurry cooler 4 is communicated with the water outlet of the evaporator of the absorption heat pump 7, and the water outlet of the slurry cooler 4 is communicated with the water inlet of the evaporator of the absorption heat pump 7.
The heated slurry from the desulfurizing tower 2 exchanges heat with low-temperature water from an evaporator of the absorption heat pump 7 in the slurry cooler 4, and the cooled slurry returns to the desulfurizing tower 2 for recycling through a pipeline; and the low-temperature water absorbs heat and then is led into the evaporator of the absorption heat pump 7 through a pipeline to be used as a low-temperature heat source of the evaporator of the absorption heat pump 7.
The water inlet of the terminal heat exchange device 10 is communicated with the water outlet of the condenser of the absorption heat pump 7, the water outlet of the terminal heat exchange device 10 is communicated with the water inlet of the absorber of the absorption heat pump 7, the terminal heat exchange device 10 is used for realizing heat exchange between hot circulating water which is circulating water between the absorption heat pump 7 and the terminal heat exchange device 10 and hot circulating water which is circulating heat carrying medium between a hot user and the terminal heat exchange device 10.
The heat circulation water from the condenser of the absorption heat pump 7 exchanges heat with the heat medium from the heat user in the terminal heat exchange device 10, the heat medium of the heat user absorbs heat and returns to the heat user for use, and the heat circulation water after heat release returns to the absorber of the absorption heat pump 7 through a pipeline and is used as a cold source of the absorption heat pump 7.
In the embodiment, the waste heat generated by the original flue gas treatment process is recycled in a gradient way, so that a high-temperature heat source and a low-temperature heat source suitable for the absorption heat pump 7 are obtained, a large amount of medium-temperature heat sources are generated by the operation of the absorption heat pump 7, and the heat source is used for the production or life of a user.
Example 2:
the embodiment of this example is substantially the same as that of example 1, except that: the comprehensive flue gas treatment system further comprises: the central control device is electrically connected with the absorption heat pump 7, and a first temperature sensor 17, a first circulating water pump 8, a flue gas analyzer 15, a slurry circulating pump 5, a second temperature sensor 18 and a second circulating water pump 9 are electrically connected with the central control device.
The first circulating water pump 8 is arranged on a pipeline between the water inlet of the flue gas cooler 1 and the water outlet of the generator of the absorption heat pump 7.
The first temperature sensor 17 is arranged on the pipe between the water outlet of the auxiliary heating 11 and the generator water inlet of the absorption heat pump 7.
A slurry circulation pump 5 is provided on a pipe between the slurry inlet of the slurry cooler 4 and the slurry outlet of the desulfurizing tower 2.
The flue gas analyzer 15 is arranged on a flue gas channel of the flue gas outlet of the desulfurizing tower 2 connected with the chimney 3.
The second circulating water pump 9 is arranged on a pipeline between the water outlet of the terminal heat exchange device 10 and the water inlet of the condenser of the absorption heat pump 7.
The second temperature sensor 18 is arranged on the pipe between the water inlet of the terminal heat exchange device 10 and the condenser water outlet of the absorption heat pump 7.
Example 3:
the embodiment of this example is substantially the same as that of example 2, except that: the comprehensive flue gas treatment system further comprises: the third circulating water pump 6, the first flue gas water content analyzer 12, the pressure analyzer 13 and the third temperature sensor 14 are electrically connected with the central control device.
The third circulating water pump 6 is arranged on a pipeline between the water inlet of the slurry cooler 4 and the water outlet of the evaporator of the absorption heat pump 7.
The first flue gas moisture content analyzer 12 and the pressure analyzer 13 are arranged on a flue gas channel which is communicated with a flue gas outlet of the flue gas cooler 1 and a flue gas inlet of the desulfurizing tower 2.
The third temperature sensor 14 is arranged on a flue gas channel of the flue gas outlet of the desulfurizing tower 2 connected with the chimney 3.
Example 4:
the embodiment of this example is substantially the same as that of example 2, except that: the comprehensive flue gas treatment system further comprises: a third circulating water pump 6, a first flue gas water content analyzer 12 and a second flue gas water content analyzer 16 which are electrically connected with the central control device.
The third circulating water pump 6 is arranged on a pipeline between the water inlet of the slurry cooler 4 and the water outlet of the evaporator of the absorption heat pump 7.
The first flue gas moisture content analyzer 12 is arranged on a flue gas channel communicated with a flue gas outlet of the flue gas cooler 1 and a flue gas inlet of the desulfurizing tower 2.
The second flue gas moisture content analyzer 16 is arranged on a flue gas channel of the flue gas outlet of the desulfurizing tower 2 connected with the chimney 3.
Example 5:
the invention also provides a control method corresponding to the comprehensive treatment system of the embodiment 2, which comprises the following steps:
as shown in fig. 2, the generator inlet water temperature Tj acquired by the first temperature sensor is acquired.
Comparing the generator inlet water temperature Tj with a driving heat source set temperature lower limit Tj0, wherein the driving heat source set temperature lower limit Tj0 is determined according to heat pump process parameters:
when the generator inlet water temperature Tj is higher than or equal to the driving heat source set temperature lower limit Tj0, no adjustment is made.
When the generator inlet water temperature is lower than the driving heat source set temperature lower limit Tj0, the operating frequency fp8 of the first circulating water pump is reduced by the central control device until the first circulating water pump reaches the minimum safe operating frequency fp80 thereof.
And stopping the frequency adjustment of the first circulating water pump when the water temperature Tj at the inlet of the generator is equal to the lower limit Tj0 of the set temperature of the driving heat source in the frequency adjustment process of the first circulating water pump.
When the first circulating water pump reaches the minimum safe working frequency fp80, if the water temperature at the inlet of the generator is still lower than the set temperature lower limit Tj0 of the driving heat source, the auxiliary heating device is started to heat by the central control device, so that the water temperature at the inlet of the generator reaches the set temperature lower limit Tj0 of the driving heat source, and the heat source of the auxiliary heating device can adopt electric energy or steam.
As shown in fig. 3, the condenser outlet water temperature Ts acquired by the second temperature sensor is acquired.
Comparing the condenser outlet water temperature Ts with a condenser outlet water set temperature lower limit Ts0, and confirming the condenser outlet water set temperature lower limit Ts0 according to the minimum temperature required by a user:
when the outlet water temperature Ts of the condenser is higher than or equal to the lower limit Ts0 of the outlet water temperature of the condenser, no adjustment is made.
When the outlet water temperature Ts of the condenser is lower than the lower limit Ts0 of the outlet water temperature of the condenser, the working frequency fp9 of the second circulating water pump is reduced through the central control device until the second circulating water pump reaches the minimum safe working frequency fp90.
And stopping the frequency adjustment of the second circulating water pump when the outlet water temperature Ts of the condenser is equal to the lower limit Ts0 of the outlet water temperature of the condenser in the frequency adjustment process of the second circulating water pump.
As shown in fig. 4, the sulfur content S of the flue gas at the outlet of the desulfurizing tower, which is collected by the flue gas analyzer, is obtained.
Comparing the sulfur content S of the flue gas at the outlet of the desulfurizing tower with a target sulfur content S0, wherein the target sulfur content S0 is determined according to the local environmental protection standard:
when the sulfur content S of the flue gas at the outlet of the desulfurizing tower is equal to the target sulfur content S0, no adjustment is made.
When the sulfur content S of the outlet flue gas of the desulfurizing tower is higher than the target sulfur content S0, the working frequency fp5 of the slurry circulating pump is increased by the central control device until the slurry circulating pump reaches the maximum safe working frequency fp51 thereof.
When the sulfur content S of the outlet flue gas of the desulfurizing tower is lower than the target sulfur content S0, the working frequency fp5 of the slurry circulating pump is reduced by the central control device until the minimum safe working frequency fp50 of the slurry circulating pump is reached.
And if the sulfur content S of the flue gas at the outlet of the desulfurizing tower is equal to the target sulfur content S0 in the process of adjusting the working frequency of the slurry circulating pump by the central control device, stopping adjusting the working frequency of the slurry circulating pump.
Example 6:
as shown in fig. 5, the present invention also provides a control method corresponding to the comprehensive flue gas treatment system of embodiment 3, comprising the following steps:
and acquiring the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower, which is acquired by the first flue gas moisture content analyzer.
And obtaining the flue gas pressure Py at the inlet of the desulfurizing tower, which is acquired by the pressure analyzer.
According to the water content Vjs of the flue gas at the inlet of the desulfurizing tower and the flue gas pressure Py at the inlet of the desulfurizing tower, calculating to obtain the target flue gas temperature at the inlet of the desulfurizing tower, namely the target flue gas temperature Ty0; the target flue gas temperature Ty0 is calculated by the water content Vjs of flue gas at the inlet of the desulfurizing tower and the pressure Py of flue gas at the inlet of the desulfurizing tower through the following formula:
Ty0＝0.0028*(Vjs*(Py+101.325)/100-101.325)^3-0.1639*(Vjs*(Py+101.325)/100-101.325)^2+4.4217*(Vjs*(Py+101.325)/100-101.325)+15.208。
and acquiring the outlet flue gas temperature Ty of the desulfurizing tower acquired by the third temperature sensor.
Comparing the target flue gas temperature Ty0 with the desulfurizing tower outlet flue gas temperature Ty:
When the target flue gas temperature Ty0 and the desulfurizing tower flue gas temperature Ty are equal, no adjustment is made.
When the outlet flue gas temperature Ty of the desulfurizing tower is higher than the target flue gas temperature Ty 0:
the operating frequency fp7 of the absorption heat pump is increased by the central control means until the absorption heat pump reaches its maximum safe operating frequency fp71.
If the absorption heat pump reaches the maximum safe operating frequency fp71, the outlet flue gas temperature Ty of the desulfurizing tower is still higher than the target flue gas temperature Ty0, and the operating frequency fp8 of the first circulating water pump is increased through the central control device until the first circulating water pump reaches the maximum safe operating frequency fp81.
If the first circulating water pump reaches the maximum safe operating frequency fp81, the outlet flue gas temperature Ty of the desulfurizing tower is still higher than the target flue gas temperature Ty0, and the operating frequency fp9 of the second circulating water pump is increased through the central control device until the second circulating water pump reaches the maximum safe operating frequency fp91.
If the second circulating water pump reaches the maximum safe operating frequency fp91, the outlet flue gas temperature Ty of the desulfurizing tower is still higher than the target flue gas temperature Ty0, and the operating frequency fp6 of the third circulating water pump is increased through the central control device until the third circulating water pump reaches the maximum safe operating frequency fp61.
If the outlet flue gas temperature Ty of the desulfurizing tower is equal to the target flue gas temperature Ty0 in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
When the outlet flue gas temperature Ty of the desulfurizing tower is lower than the target flue gas temperature Ty 0:
the operating frequency fp8 of the first circulating water pump is reduced by the central control means until the first circulating water pump reaches its minimum safe operating frequency fp80.
If the first circulating water pump reaches the minimum safe operating frequency fp80, the outlet flue gas temperature Ty of the desulfurizing tower is still lower than the target flue gas temperature Ty0, and the operating frequency fp9 of the second circulating water pump is reduced through the central control device until the second circulating water pump reaches the minimum safe operating frequency fp90.
If the second circulating water pump reaches the minimum safe operating frequency fp90, the outlet flue gas temperature Ty of the desulfurizing tower is still lower than the target flue gas temperature Ty0, and the operating frequency fp6 of the third circulating water pump is reduced through the central control device until the third circulating water pump reaches the minimum safe operating frequency fp60.
If the third circulating water pump reaches the minimum safe operating frequency fp60, the outlet flue gas temperature Ty of the desulfurizing tower is still lower than the target flue gas temperature Ty0, and the operating frequency fp7 of the absorption heat pump is reduced through the central control device until the absorption heat pump reaches the minimum safe operating frequency fp70.
If the outlet flue gas temperature Ty of the desulfurizing tower is equal to the target flue gas temperature Ty0 in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
In order to ensure stable operation of the system and reduce unnecessary frequent actions, when the target flue gas temperature Ty0 and the flue gas temperature Ty at the outlet of the desulfurizing tower are compared, a specific confidence interval DeltaT is designed according to different practical application scenes, and the sum of the target flue gas temperature Ty0 and the confidence interval DeltaT, namely (Ty0+/-DeltaT) is taken as a whole to be compared with the flue gas temperature Ty at the outlet of the desulfurizing tower.
Example 7:
as shown in fig. 6, the present invention also provides a control method corresponding to the comprehensive flue gas treatment system of embodiment 4, comprising the following steps:
and acquiring the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower, which is acquired by the first flue gas moisture content analyzer.
And obtaining the water content Vcs of the flue gas at the outlet of the desulfurizing tower, which is acquired by the second flue gas water content analyzer.
Comparing the water content Vjs of flue gas at the inlet of the desulfurizing tower with the water content Vcs of flue gas at the outlet of the desulfurizing tower:
When the water content Vjs of the flue gas at the inlet of the desulfurizing tower is equal to the water content Vcs of the flue gas at the outlet of the desulfurizing tower, no adjustment is made.
When the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower is lower than the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower:
the operating frequency fp7 of the absorption heat pump is increased by the central control means until the absorption heat pump reaches its maximum safe operating frequency fp71.
If the absorption heat pump reaches the maximum safe operating frequency fp7, the water content Vjs of the flue gas at the inlet of the desulfurizing tower is still lower than the water content Vcs of the flue gas at the outlet of the desulfurizing tower, and the operating frequency fp8 of the first circulating water pump is increased through the central control device until the first circulating water pump reaches the maximum safe operating frequency fp81.
If the first circulating water pump reaches the maximum safe operating frequency fp81, the water content Vjs of the flue gas at the inlet of the desulfurizing tower is still lower than the water content Vcs of the flue gas at the outlet of the desulfurizing tower, and the operating frequency fp9 of the second circulating water pump is increased through the central control device until the second circulating water pump reaches the maximum safe operating frequency fp91.
If the second circulating water pump reaches the maximum safe operating frequency fp91, the water content Vjs of the flue gas at the inlet of the desulfurizing tower is still lower than the water content Vcs of the flue gas at the outlet of the desulfurizing tower, and the operating frequency fp6 of the third circulating water pump is increased through the central control device until the third circulating water pump reaches the maximum safe operating frequency fp61.
When the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower is lower than the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower:
the operating frequency fp8 of the first circulating water pump is reduced by the central control means until the first circulating water pump reaches its minimum safe operating frequency fp80.
If the first circulating water pump reaches the minimum safe operating frequency fp80, the water content Vcs of the flue gas at the outlet of the desulfurizing tower is still lower than the water content Vjs of the flue gas at the inlet of the desulfurizing tower, and the operating frequency fp9 of the second circulating water pump is reduced through the central control device until the second circulating water pump reaches the minimum safe operating frequency fp90.
If the second circulating water pump reaches the minimum safe operating frequency fp90, the water content Vcs of the flue gas at the outlet of the desulfurizing tower is still lower than the water content Vjs of the flue gas at the inlet of the desulfurizing tower, and the operating frequency fp6 of the third circulating water pump is reduced through the central control device until the third circulating water pump reaches the minimum safe operating frequency fp60.
If the third circulating water pump reaches the minimum safe operating frequency fp60, the water content Vcs of the flue gas at the outlet of the desulfurizing tower is still lower than the water content Vjs of the flue gas at the inlet of the desulfurizing tower, and the operating frequency fp7 of the absorption heat pump is reduced by the central control device until the absorption heat pump reaches the minimum safe operating frequency fp70.
And if the water content Vcs of the flue gas at the outlet of the desulfurizing tower is equal to the water content Vjs of the flue gas at the inlet of the desulfurizing tower in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
In order to ensure stable operation of the system and reduce unnecessary frequent actions, when the water content Vjs of the flue gas at the inlet of the desulfurizing tower and the water content Vcs of the flue gas at the outlet of the desulfurizing tower are compared, a specific confidence interval DeltaV is designed according to different practical application scenes, and the sum of the water content Vjs of the flue gas at the inlet of the desulfurizing tower and the confidence interval DeltaV, namely (Vjs +/-DeltaV) is taken as a whole to be compared with the water content Vcs of the flue gas at the outlet of the desulfurizing tower.
Program portions of the technology may be considered to be "products" or "articles of manufacture" in the form of executable code and/or associated data, embodied or carried out by a computer readable medium. A tangible, persistent storage medium may include any memory or storage used by a computer, processor, or similar device or related module. Such as various semiconductor memories, tape drives, disk drives, or the like, capable of providing storage functionality for software.
All or a portion of the software may sometimes communicate over a network, such as the internet or other communication network. Such communication may load software from one computer device or processor to another. For example: a hardware platform loaded from a server or host computer of the video object detection device to a computer environment, or other computer environment implementing the system, or similar functioning system related to providing information needed for object detection. Thus, another medium capable of carrying software elements may also be used as a physical connection between local devices, such as optical, electrical, electromagnetic, etc., propagating through cable, optical cable, air, etc. Physical media used for carrier waves, such as electrical, wireless, or optical, may also be considered to be software-bearing media. Unless limited to a tangible "storage" medium, other terms used herein to refer to a computer or machine "readable medium" mean any medium that participates in the execution of any instructions by a processor.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; it will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented by general-purpose computer means, alternatively they may be implemented by program code executable by computing means, whereby they may be stored in storage means for execution by computing means, or they may be made into individual integrated circuit modules separately, or a plurality of modules or steps in them may be made into a single integrated circuit module. The present invention is not limited to any specific combination of hardware and software.
Also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. A flue gas integrated treatment system, characterized in that the flue gas integrated treatment system comprises: the system comprises an absorption heat pump, a flue gas cooler, a desulfurizing tower, a slurry cooler, a terminal heat exchange device and an auxiliary heating device;
the inlet of the flue gas cooler is communicated with the main process smoke discharging channel; the flue gas outlet of the flue gas cooler is communicated with the flue gas inlet of the desulfurizing tower, and the flue gas outlet of the desulfurizing tower is communicated with a chimney;
the water inlet of the smoke cooler is communicated with the water outlet of the generator of the absorption heat pump, the water outlet of the smoke cooler is communicated with the water inlet of the auxiliary heating device, and the water inlet of the generator of the absorption heat pump is communicated with the water outlet of the auxiliary heating device;
the slurry outlet of the desulfurizing tower is communicated with the slurry inlet of the slurry cooler; the slurry outlet of the slurry cooler is communicated with the slurry inlet of the desulfurizing tower;
the water inlet of the slurry cooler is communicated with the water outlet of the evaporator of the absorption heat pump, and the water outlet of the slurry cooler is communicated with the water inlet of the evaporator of the absorption heat pump;
The terminal heat exchange device is used for realizing heat exchange between heat circulating water and heat user heat medium, wherein the heat circulating water is circulating water between the absorption heat pump and the terminal heat exchange device, and the heat user heat medium is circulating heat carrying medium between the terminal heat exchange device and a heat user;
the comprehensive flue gas treatment system further comprises: the system comprises a central control device electrically connected with an absorption heat pump, and a first temperature sensor, a first circulating water pump, a smoke analyzer, a slurry circulating pump, a second temperature sensor and a second circulating water pump which are electrically connected with the central control device;
the first circulating water pump is arranged on a pipeline between the water inlet of the flue gas cooler and the water outlet of the generator of the absorption heat pump;
the first temperature sensor is arranged on a pipeline between the water outlet of the auxiliary heating device and the generator water inlet of the absorption heat pump;
the slurry circulating pump is arranged on a pipeline between a slurry inlet of the slurry cooler and a slurry outlet of the desulfurizing tower;
The flue gas analyzer is arranged on a flue gas channel of the flue gas outlet of the desulfurizing tower, which is connected with a chimney;
the second circulating water pump is arranged on a pipeline between the water outlet of the terminal heat exchange device and the water inlet of the absorber of the absorption heat pump;
the second temperature sensor is arranged on a pipeline between the water inlet of the terminal heat exchange device and the condenser water outlet of the absorption heat pump.
2. The integrated flue gas treatment system of claim 1, further comprising: the third circulating water pump, the first smoke water content analyzer, the pressure analyzer and the third temperature sensor are electrically connected with the central control device;
the third circulating water pump is arranged on a pipeline between the water inlet of the slurry cooler and the water outlet of the evaporator of the absorption heat pump;
the first flue gas moisture content analyzer and the pressure analyzer are arranged on a flue gas channel which is communicated with a flue gas outlet of the flue gas cooler and a flue gas inlet of the desulfurizing tower;
the third temperature sensor is arranged on a flue gas channel, wherein the flue gas outlet of the desulfurizing tower is connected with a chimney.
3. The integrated flue gas treatment system of claim 1, further comprising: the third circulating water pump, the first smoke water content analyzer and the second smoke water content analyzer are electrically connected with the central control device;
The third circulating water pump is arranged on a pipeline between the water inlet of the slurry cooler and the water outlet of the evaporator of the absorption heat pump;
the first flue gas moisture content analyzer is arranged on a flue gas channel communicated with a flue gas outlet of the flue gas cooler and a flue gas inlet of the desulfurizing tower;
the second flue gas moisture content analyzer is arranged on a flue gas channel connected with the flue gas outlet of the desulfurizing tower and the chimney.
4. A control method of a comprehensive flue gas treatment system, applied to the comprehensive flue gas treatment system according to claim 1, characterized in that the control method comprises:
acquiring the water temperature of the inlet of the generator acquired by the first temperature sensor;
comparing the generator inlet water temperature with a drive heat source set temperature lower limit:
when the temperature of the inlet water of the generator is higher than or equal to the lower limit of the set temperature of the driving heat source, no adjustment is made;
when the temperature of the inlet water of the generator is lower than the lower limit of the set temperature of the driving heat source, the working frequency of the first circulating water pump is reduced through the central control device until the first circulating water pump reaches the minimum safe working frequency;
if the first circulating water pump reaches the minimum safe working frequency, the water temperature at the inlet of the generator is still lower than the set temperature lower limit of the driving heat source of the absorption heat pump, the auxiliary heating device is started through the central control device, the heating power of the auxiliary heating device is gradually increased, and the water is heated until the water temperature at the inlet of the generator is equal to the set temperature lower limit of the driving heat source of the absorption heat pump, and the auxiliary heating device is stopped being regulated;
Acquiring the outlet water temperature of the condenser acquired by the second temperature sensor;
comparing the water temperature at the outlet of the condenser with the lower limit of the set temperature of the outlet water of the condenser:
when the water temperature at the outlet of the condenser is higher than or equal to the lower limit of the set temperature of the outlet water of the condenser, no adjustment is made;
when the outlet water temperature of the condenser is lower than the lower limit of the outlet water set temperature of the condenser, reducing the working frequency of the second circulating water pump through a central control device until the second circulating water pump reaches the minimum safe working frequency;
obtaining sulfur content of flue gas at an outlet of a desulfurizing tower, which is acquired by the flue gas analyzer;
comparing the sulfur content of the flue gas at the outlet of the desulfurizing tower with the target sulfur content:
when the sulfur content of the flue gas at the outlet of the desulfurizing tower is equal to the target sulfur content, no adjustment is made;
when the sulfur content of the outlet flue gas of the desulfurizing tower is higher than the target sulfur content, the central control device increases the working frequency of the slurry circulating pump until the slurry circulating pump reaches the maximum safe working frequency;
when the sulfur content of the outlet flue gas of the desulfurizing tower is lower than the target sulfur content, the central control device reduces the working frequency of the slurry circulating pump until the slurry circulating pump reaches the minimum safe working frequency;
And if the sulfur content of the flue gas at the outlet of the desulfurizing tower is equal to the target sulfur content in the process of adjusting the working frequency of the slurry circulating pump by the central control device, stopping adjusting the working frequency of the slurry circulating pump.
5. A control method of a comprehensive flue gas treatment system, applied to the comprehensive flue gas treatment system according to claim 2, characterized in that the control method comprises:
acquiring the water content of flue gas at the inlet of the desulfurizing tower, which is acquired by the first flue gas water content analyzer;
acquiring the pressure of flue gas at the inlet of the desulfurizing tower, which is acquired by the pressure analyzer;
calculating to obtain a target flue gas temperature according to the water content of the flue gas at the inlet of the desulfurizing tower and the pressure of the flue gas at the inlet of the desulfurizing tower;
acquiring the temperature of flue gas at the outlet of the desulfurizing tower acquired by the third temperature sensor;
comparing the target flue gas temperature with the flue gas temperature at the outlet of the desulfurizing tower:
when the target flue gas temperature is equal to the flue gas temperature at the outlet of the desulfurizing tower, no adjustment is made;
when the outlet flue gas temperature of the desulfurizing tower is higher than the target flue gas temperature:
the working frequency of the absorption heat pump is increased through a central control device until the absorption heat pump reaches the maximum safe working frequency;
If the absorption heat pump reaches the maximum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still higher than the temperature of the target flue gas, and the working frequency of the first circulating water pump is increased through a central control device until the first circulating water pump reaches the maximum safe working frequency;
if the first circulating water pump reaches the maximum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still higher than the temperature of the target flue gas, and the working frequency of the second circulating water pump is increased through a central control device until the second circulating water pump reaches the maximum safe working frequency;
if the second circulating water pump reaches the maximum safe working frequency, the outlet flue gas temperature of the desulfurizing tower is still higher than the target flue gas temperature, and the working frequency of the third circulating water pump is increased through a central control device until the third circulating water pump reaches the maximum safe working frequency;
when the outlet flue gas temperature of the desulfurizing tower is lower than the target flue gas temperature:
reducing the working frequency of the first circulating water pump through a central control device until the first circulating water pump reaches the minimum safe working frequency;
if the first circulating water pump reaches the minimum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still lower than the temperature of the target flue gas, and the working frequency of the second circulating water pump is reduced through a central control device until the second circulating water pump reaches the minimum safe working frequency;
If the second circulating water pump reaches the minimum safe working frequency, the outlet flue gas temperature of the desulfurizing tower is still lower than the target flue gas temperature, and the working frequency of the third circulating water pump is reduced through a central control device until the third circulating water pump reaches the minimum safe working frequency;
if the third circulating water pump reaches the minimum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still lower than the temperature of the target flue gas, and the working frequency of the absorption heat pump is reduced through a central control device until the absorption heat pump reaches the minimum safe working frequency;
and stopping the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump if the outlet flue gas temperature of the desulfurizing tower is equal to the target flue gas temperature in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump.
6. The control method according to claim 5, wherein when comparing the target flue gas temperature with the desulfurizing tower outlet flue gas temperature, a specific confidence interval is designed according to the actual application scene, and the sum of the target flue gas temperature and the confidence interval is compared with the desulfurizing tower outlet flue gas temperature as a whole.
7. A control method of a comprehensive flue gas treatment system, applied to the comprehensive flue gas treatment system according to claim 3, characterized in that the control method comprises:
acquiring the water content of flue gas at the inlet of the desulfurizing tower, which is acquired by the first flue gas water content analyzer;
acquiring the water content of the flue gas at the outlet of the desulfurizing tower, which is acquired by the second flue gas water content analyzer;
comparing the water content of the flue gas at the inlet of the desulfurizing tower with the water content of the flue gas at the outlet of the desulfurizing tower:
when the water content of the flue gas at the inlet of the desulfurizing tower is equal to that of the flue gas at the outlet of the desulfurizing tower, no adjustment is made;
when the moisture content of the flue gas at the inlet of the desulfurizing tower is lower than that of the flue gas at the outlet of the desulfurizing tower:
the working frequency of the absorption heat pump is increased through a central control device until the absorption heat pump reaches the maximum safe working frequency;
if the absorption heat pump reaches the maximum safe working frequency, the water content of the flue gas at the inlet of the desulfurizing tower is still lower than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the first circulating water pump is increased through a central control device until the first circulating water pump reaches the maximum safe working frequency;
If the first circulating water pump reaches the maximum safe working frequency, the water content of the flue gas at the inlet of the desulfurizing tower is still lower than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the second circulating water pump is increased through a central control device until the second circulating water pump reaches the maximum safe working frequency;
if the second circulating water pump reaches the maximum safe working frequency, the water content of the flue gas at the inlet of the desulfurizing tower is still lower than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the third circulating water pump is increased through a central control device until the third circulating water pump reaches the maximum safe working frequency;
when the moisture content of the flue gas at the outlet of the desulfurizing tower is lower than that of the flue gas at the inlet of the desulfurizing tower:
reducing the working frequency of the first circulating water pump through a central control device until the first circulating water pump reaches the minimum safe working frequency;
if the first circulating water pump reaches the minimum safe working frequency, the water content of the flue gas at the outlet of the desulfurizing tower is still lower than that of the flue gas at the inlet of the desulfurizing tower, and the working frequency of the second circulating water pump is reduced through a central control device until the second circulating water pump reaches the minimum safe working frequency;
If the second circulating water pump reaches the minimum safe working frequency, the water content of the flue gas at the outlet of the desulfurizing tower is still lower than that of the flue gas at the inlet of the desulfurizing tower, and the working frequency of the third circulating water pump is reduced through a central control device until the third circulating water pump reaches the minimum safe working frequency;
if the third circulating water pump reaches the minimum safe working frequency, the water content of the flue gas at the outlet of the desulfurizing tower is still lower than that of the flue gas at the inlet of the desulfurizing tower, and the working frequency of the absorption heat pump is reduced through a central control device until the absorption heat pump reaches the minimum safe working frequency;
and if the water content of the flue gas at the outlet of the desulfurizing tower is equal to that of the flue gas at the inlet of the desulfurizing tower in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, stopping adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump.
8. The control method according to claim 7, wherein when the water content of the flue gas at the inlet of the desulfurizing tower is compared with the water content of the flue gas at the outlet of the desulfurizing tower, a specific confidence interval is designed according to the different practical application scenes, and the sum of the water content of the flue gas at the inlet of the desulfurizing tower and the confidence interval is compared with the water content of the flue gas at the outlet of the desulfurizing tower as a whole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111478576.5A CN114135890B (en) | 2021-12-06 | 2021-12-06 | Comprehensive treatment system for flue gas and control method thereof |
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